Input impedance of ENGL Blackmore (or Savage, or Fireball)?
- Thread starter uOpt
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koshikas
New member
Re: Input impedance of ENGL Blackmore (or Savage, or Fireball)?
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how, I want to do this in few of my amps but don't know how
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Re: Input impedance of ENGL Blackmore (or Savage, or Fireball)?
Where is all this going.?
Do you have a schematic.?
The "typical" Fender/Marshall amp had 2 inputs.
1. This was a 1M input impedance with a series resistance of about 34k. That 1M is a huge impedance, so just about all your signal is going to hit the first tube.
2. This shorts out the 1M and implements the two 68k resistors as a 2:1 voltage divider.....so this will present a pretty big load to whatever you have coming into the amp.
Traditionally.....#1 is what guys used for single coils, and #2 was used for hums, because they were a much hotter signal. But there is no right and wrong.
But something tells me this has nothing to do with guitars.....are you wondering about the impedance some type of effect will see at the main input.?
Like I say.....Engl should be able to clear all this up for you with one email.....or just look at the schem (if available) to see how their input(s) are designed.
good luck
Where is all this going.?
Do you have a schematic.?
The "typical" Fender/Marshall amp had 2 inputs.
1. This was a 1M input impedance with a series resistance of about 34k. That 1M is a huge impedance, so just about all your signal is going to hit the first tube.
2. This shorts out the 1M and implements the two 68k resistors as a 2:1 voltage divider.....so this will present a pretty big load to whatever you have coming into the amp.
Traditionally.....#1 is what guys used for single coils, and #2 was used for hums, because they were a much hotter signal. But there is no right and wrong.
But something tells me this has nothing to do with guitars.....are you wondering about the impedance some type of effect will see at the main input.?
Like I say.....Engl should be able to clear all this up for you with one email.....or just look at the schem (if available) to see how their input(s) are designed.
good luck
uOpt
Something Cool
Re: Input impedance of ENGL Blackmore (or Savage, or Fireball)?
In theory you just need a stable test signal, a couple crocodile clips and a sensitive enough multimeter. Then you compare voltage at different measurement points. I need to quit being lazy.
In theory you just need a stable test signal, a couple crocodile clips and a sensitive enough multimeter. Then you compare voltage at different measurement points. I need to quit being lazy.
uOpt
Something Cool
Re: Input impedance of ENGL Blackmore (or Savage, or Fireball)?
Input impedance combines with the volume pot value in annoyingly complicated ways. They destabilize my testing. I want to take control of who's got what input impedance and see whether it matters, e.g. whether users of low input impedance amps should use higher value pots.
I would also use my ART tube preamp as a first stage, which has adjustable input impedance. Obviously to get the same basic signals out of the guitar I need to match the input impedance of my amp.
Of course all that goes out the window once an active pedal is involved.
Input impedance combines with the volume pot value in annoyingly complicated ways. They destabilize my testing. I want to take control of who's got what input impedance and see whether it matters, e.g. whether users of low input impedance amps should use higher value pots.
I would also use my ART tube preamp as a first stage, which has adjustable input impedance. Obviously to get the same basic signals out of the guitar I need to match the input impedance of my amp.
Of course all that goes out the window once an active pedal is involved.
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